<template>
  <div id="app">
    <div>
      <span>全选:</span>
      <input type="checkbox" v-model="aa" />
      <button @click="bb">反选</button>
      <ul>
        <li v-for="item in arr" :key="item.name">
          <input type="checkbox" v-model="item.checked"/>
          <span>{{ item.name }}</span>
        </li>
      </ul>
    </div>
  </div>
</template>

<script>
export default {
  name: "App",
  data() {
    return {
      arr: [
        {
          name: "猪八戒",
          checked: false,
        },
        {
          name: "孙悟空",
          checked: false,
        },
        {
          name: "唐僧",
          checked: false,
        },
        {
          name: "白龙马",
          checked: false,
        },
      ],
    };
  },
  computed: {
    aa: {
      get() {
        return this.arr.every((item) => item.checked === true);
      },
      set(val){
        this.arr.forEach(item=>{
          item.checked=val
        })
      }
    },
  },
  methods:{
    bb(){
      this.arr.forEach(item=>{
        item.checked=!item.checked
      })
    }
  }
};
</script>

<style>
</style>